/*
 * @Author: szx
 * @Date: 2022-03-22 13:02:11
 * @LastEditTime: 2022-03-22 13:16:05
 * @Description:
 * @FilePath: \leetcode\剑指offer\30\30.js
 */
/**
 * initialize your data structure here.
 */
var MinStack = function () {
    this.stack = [];
    this.minStack = [];
};

/**
 * @param {number} x
 * @return {void}
 */
MinStack.prototype.push = function (x) {
    this.stack.push(x);
    if (this.minStack.length == 0 || x <= this.minStack[this.minStack.length - 1]) {
        this.minStack.push(x);
    }
};

/**
 * @return {void}
 */
MinStack.prototype.pop = function () {
    if (this.stack.pop() == this.minStack[this.minStack.length - 1]) {
        this.minStack.pop();
    }
};

/**
 * @return {number}
 */
MinStack.prototype.top = function () {
    return this.stack[this.stack.length - 1];
};

/**
 * @return {number}
 */
MinStack.prototype.min = function () {
    return this.minStack[this.minStack.length - 1];
};

/**
 * Your MinStack object will be instantiated and called as such:
 * var obj = new MinStack()
 * obj.push(x)
 * obj.pop()
 * var param_3 = obj.top()
 * var param_4 = obj.min()
 */
